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                [Ynoi2017]由乃运椰子                </h1>
                <p>时间限制：4s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：10MB</p>			</div>
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                                <h3>题目描述</h3><p><div>二次元的由乃为了致富，决定引进日本的椰子树。由乃的椰子园十分现代化，椰子园中有一套独特的交通系统。但</div>
<div>是日本没有椰子树啊。。。所以这一切都是由乃的梦。由乃梦到自己的椰子树上涨了好多好多椰子，非常高兴--直</div>
<div>到她看到了一个数据结构题：给你一个字符串a，每次询问一段区间的贡献</div>
<div>贡献定义：</div>
<div>每次从这个区间中随机拿出一个字符x，然后把x从这个区间中删除，你要维护一个集合S如果S为空，你rp减1如果S</div>
<div>中有一个元素不小于x，则你rp减1，清空S之后将x插入S</div>
<div>由于由乃不是大爷，平时做过的题考试都不会考到，所以每次询问你搞完这段区间的字符之后最多还有多少rp？rp</div>
<div>初始为0询问之间不互相影响~由于由乃最近没事干，所以她决定卡常卡空间，请注意</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>第一行两个数n，m，表示字符串长度与询问次数</div>
<div>之后一行n个数，表示字符串</div>
<div>由于你是大爷，所以字符集1e9</div>
<div>之后m行每行两个数，表示询问的左右区间</div>
<div></div></p><hr/><h3>输出格式</h3><p><div>m行，每行一个数表示答案</div>
<div></div>
<p></p></p><hr/><h3>样例输入</h3><pre>3 3
3 3 3
3 3
3 3
3 3</pre><hr/><h3>样例输出</h3><pre>-1
-1
-1</pre><hr/><h3>提示</h3><p><div>1 &lt;= n,m &lt;= 60000,<span style="font-family: Helvetica, 'Microsoft Yahei', verdana; font-size: 14.3999996185303px; line-height: 18.659200668335px;">本题强制在线，每次操作的l和r要异或上上次答案</span><span style="font-family: Helvetica, 'Microsoft Yahei', verdana; font-size: 14.3999996185303px; line-height: 18.659200668335px;">本题强制在线，每次操作的l和r要异或上上次答案</span></div>
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<p></p></p><hr/><h3>题目来源</h3><p>By 佚名提供</p>
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